Ning Yang created an issue: 
https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/18



## Summary

When I tested the genet driver, I encountered this issue.


1. I use the following command on my PC to test `tx`. It works very well.
```
yangn0@yangning-PC:~$ sudo curl -o /dev/null ftp://192.168.1.100/dev/zero
[sudo] password for yangn0:
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0  987M    0     0  50.6M      0 --:--:--  0:00:19 --:--:-- 50.6M^C
```
2. I use the following command on my PC to test `rx`. After transmitting a 
small amount of data, the Current Speed drops to 0. And 
rtems shell printed `[zone: mbuf_cluster] kern.ipc.nmbclusters limit reached`.
```
yangn0@yangning-PC:~$ sudo curl -T /dev/zero ftp://192.168.1.100/dev/null
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 10.6M    0     0    0 10.6M      0   448k --:--:--  0:00:24 --:--:--     0^C
```

RTEMS Shell:
![image](/uploads/0ef79b49c59f5ef986fee38cd154912c/image.png)

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/18
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